A finite-element model for concurrent confined-unconfined zones in an aquifer

Abstract

The numerical simulation of the situation of concurrent confined and unconfined zones in a groundwater aquifer system is carried out by using the finite-element method with four-sided mixed-curved isoparametric elements. The model is limited to the steady state and is based on Dupuit's assumptions. The results of the model for a test situation indicate that the model can be used for prediction of the occurrence of unconfined regions around over-pumped wells in an originally confined aquifer of which the interfaces between the confined and unconfined regions may be estimated.